@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;500;600;700&family=Nunito:wght@300;400;500;600;700&display=swap');

:root{
  --paper:#f5e6c8;
  --paper-2:#efdcb6;
  --paper-3:#e4cda0;
  --caramel:#d4a574;
  --caramel-d:#a97642;
  --ink:#262117;
  --ink-2:#4c412e;
  --line:rgba(38,33,23,.24);
  --line-2:rgba(38,33,23,.12);
  --glass:rgba(255,248,232,.40);
  --railw:96px;
  --headh:58px;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  margin:0;
  overflow-x:hidden;
  background:var(--paper);
  color:var(--ink);
  font-family:'Fredoka','Nunito',"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}

body.locked{overflow:hidden}

/* 胶片颗粒 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:55;
  pointer-events:none;
  opacity:.15;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
}

/* 漏光 */
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:54;
  pointer-events:none;
  background:
    radial-gradient(circle at 6% 10%, rgba(212,165,116,.45), rgba(212,165,116,0) 44%),
    radial-gradient(circle at 94% 82%, rgba(190,110,70,.22), rgba(190,110,70,0) 46%);
  animation:leak 15s ease-in-out infinite alternate;
}

@keyframes leak{
  0%{opacity:.55;transform:translate3d(0,0,0) scale(1)}
  100%{opacity:.95;transform:translate3d(-1.5%,1.5%,0) scale(1.04)}
}

p{margin:0 0 1rem}

a{color:inherit}

.vanish{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}

/* ---------- 左侧固定栏 ---------- */
.rail{
  position:fixed;
  left:0;
  top:0;
  bottom:0;
  z-index:40;
  width:var(--railw);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.5rem;
  padding:.7rem .4rem 1rem;
  color:var(--paper);
  background:linear-gradient(180deg,rgba(38,33,23,.97),rgba(38,33,23,.9));
  border-right:1px solid var(--ink);
}

.rail-nav{display:flex;flex-direction:column;width:100%}

.rail-nav a{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:.35rem .15rem;
  font-size:1rem;
  letter-spacing:.04em;
  text-align:center;
  text-decoration:none;
  color:var(--paper);
  border-bottom:1px solid rgba(245,230,200,.14);
}

.rail-nav a:hover{background:rgba(245,230,200,.12);color:var(--caramel)}

.rail-brand{
  margin:auto 0;
  padding:.7rem .15rem;
  font-size:1.02rem;
  font-weight:700;
  line-height:1.3;
  letter-spacing:.1em;
  text-align:center;
  text-decoration:none;
  color:var(--paper);
  border-top:1px solid rgba(245,230,200,.38);
  border-bottom:1px solid rgba(245,230,200,.38);
}

.rail-burger,
.rail-find{
  width:100%;
  min-height:54px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:.3rem;
  font:inherit;
  font-size:1rem;
  color:var(--paper);
  background:none;
  border:1px solid rgba(245,230,200,.32);
  cursor:pointer;
}

.rail-burger:hover,
.rail-find:hover{background:rgba(245,230,200,.14)}

.bars{position:relative;width:20px;height:2px;background:currentColor}
.bars::before,
.bars::after{content:"";position:absolute;left:0;width:20px;height:2px;background:currentColor}
.bars::before{top:-6px}
.bars::after{top:6px}

.lens{width:13px;height:13px;border:2px solid currentColor;border-radius:50%;position:relative}
.lens::after{content:"";position:absolute;right:-5px;bottom:-4px;width:6px;height:2px;background:currentColor;transform:rotate(45deg)}

/* ---------- 全屏遮罩菜单 ---------- */
.veil{
  position:fixed;
  inset:0;
  z-index:90;
  display:flex;
  flex-direction:column;
  gap:1.4rem;
  padding:clamp(1.1rem,4vw,2.4rem);
  overflow-y:auto;
  color:var(--paper);
  background:rgba(38,33,23,.975);
  opacity:0;
  visibility:hidden;
  transition:opacity .28s ease;
}

.veil.open{opacity:1;visibility:visible}

.veil-x{
  align-self:flex-end;
  min-height:44px;
  padding:.4rem 1.2rem;
  font:inherit;
  font-size:1rem;
  color:var(--paper);
  background:none;
  border:1px solid rgba(245,230,200,.45);
  cursor:pointer;
}

.veil-find{display:flex;gap:.5rem;width:100%;max-width:560px}

.veil-find input{
  flex:1;
  min-height:48px;
  padding:.5rem .8rem;
  font:inherit;
  font-size:1rem;
  color:var(--paper);
  background:transparent;
  border:1px solid rgba(245,230,200,.45);
}

.veil-find button{
  min-height:48px;
  padding:0 1.2rem;
  font:inherit;
  font-size:1rem;
  font-weight:600;
  color:var(--ink);
  background:var(--caramel);
  border:0;
  cursor:pointer;
}

.veil-nav{display:grid}

.veil-nav a{
  display:flex;
  align-items:center;
  min-height:52px;
  padding:.5rem .2rem;
  font-size:1.35rem;
  letter-spacing:.08em;
  text-decoration:none;
  color:var(--paper);
  border-bottom:1px dashed rgba(245,230,200,.28);
}

.veil-nav a:hover{color:var(--caramel)}

/* ---------- 头图 ---------- */
main{padding-bottom:3rem}

main [id]{scroll-margin-top:5rem}

.hero{
  position:relative;
  display:grid;
  grid-template-columns:1fr;
  gap:1.1rem;
  align-items:center;
  min-height:45vh;
  padding:1.1rem clamp(1rem,3vw,2.6rem) 1.6rem;
  overflow:hidden;
  border-bottom:1px solid var(--line);
}

.hero-slash{
  position:absolute;
  top:0;
  right:0;
  bottom:0;
  width:52%;
  pointer-events:none;
  z-index:0;
  background:linear-gradient(118deg,rgba(212,165,116,.5),rgba(212,165,116,0) 68%);
  clip-path:polygon(24% 0,100% 0,100% 100%,0 100%);
}

.hero-shot{
  position:relative;
  z-index:1;
  margin:0;
  padding:.6rem .6rem 1.7rem;
  background:#fdf6e7;
  border:1px solid var(--line);
  box-shadow:0 12px 28px rgba(38,33,23,.2);
  transform:rotate(-1.3deg);
}

.hero-shot img,
.hero-shot .ph{
  display:block;
  width:100%;
  aspect-ratio:2 / 1;
  object-fit:cover;
  background:repeating-linear-gradient(135deg,var(--paper-3) 0 12px,var(--paper-2) 12px 24px);
}

.hero-shot img{
  filter:sepia(.2) contrast(1.06) saturate(.82);
  animation:vhs 7s steps(2,end) infinite;
}

@keyframes vhs{
  0%,100%{transform:translateX(0) skewX(0)}
  48%{transform:translateX(1px) skewX(.5deg)}
  50%{transform:translateX(-1px) skewX(-.6deg)}
}

.hero-copy{position:relative;z-index:1;text-align:center}

.hero-copy h1{
  margin:0 0 .5rem;
  font-size:clamp(1.75rem,4.4vw,2.7rem);
  line-height:1.25;
  letter-spacing:.02em;
}

.hero-desc{
  max-width:42ch;
  margin:0 auto;
  font-size:1rem;
  color:var(--ink-2);
}

/* ---------- 正文骨架 ---------- */
.wrap{
  display:grid;
  grid-template-columns:1fr;
  gap:1.4rem;
  max-width:1180px;
  margin:0 auto;
  padding:1.8rem clamp(1rem,3vw,2.4rem);
}

.side{
  padding:1rem .8rem;
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(5px) saturate(1.05);
}

.side-h{
  margin:0 0 .6rem;
  font-size:1rem;
  letter-spacing:.22em;
}

.side-h span{box-shadow:inset 0 -.42em 0 rgba(212,165,116,.6)}

.side-list{
  counter-reset:s;
  display:flex;
  flex-wrap:wrap;
  gap:.35rem;
  margin:0 0 1rem;
  padding:0;
  list-style:none;
}

.side-list li{flex:1 1 42%;counter-increment:s}

.side-list a{
  display:flex;
  align-items:baseline;
  gap:.45rem;
  min-height:44px;
  padding:.5rem .55rem;
  font-size:1rem;
  text-decoration:none;
  color:var(--ink);
  background:rgba(255,248,232,.5);
  border:1px solid var(--line-2);
}

.side-list a::before{
  content:counter(s,decimal-leading-zero);
  font-size:1rem;
  opacity:.55;
}

.side-list a:hover{background:var(--caramel);color:var(--ink)}

.side-top{margin:0}
.side-top a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:.4rem .8rem;
  font-size:1rem;
  color:var(--ink);
  border:1px solid var(--line);
  text-decoration:none;
  background:rgba(255,248,232,.5);
}
.side-top a:hover{background:var(--caramel)}

.body-sec{min-width:0}

.content{max-width:74ch}

.content section{
  margin:0 0 1rem;
  padding:1.7rem clamp(.9rem,2.4vw,1.6rem);
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(5px) saturate(1.05);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.55);
}

.content h2{
  margin:0 0 .8rem;
  font-size:clamp(1.3rem,2.7vw,1.7rem);
  line-height:1.35;
}

.content h2 span{box-shadow:inset 0 -.34em 0 rgba(212,165,116,.55)}

.content h3{
  margin:1.4rem 0 .6rem;
  font-size:1.15rem;
  line-height:1.4;
}

.content h3 span{box-shadow:inset 0 -.3em 0 rgba(212,165,116,.45)}

.content p{line-height:1.85;color:var(--ink-2)}

.content ul,
.content ol{pargin:0;margin:0 0 1rem;padding-left:1.35rem}
.content li{margin-bottom:.45rem;line-height:1.75}

.content a{color:var(--caramel-d);text-underline-offset:3px}

.content img{max-width:100%;height:auto;border:1px solid var(--line)}

.content time{
  display:inline-block;
  padding:.1rem .5rem;
  font-size:1rem;
  border:1px solid var(--line);
  background:rgba(212,165,116,.28);
}

.content blockquote{
  margin:0 0 1rem;
  padding:.6rem 1rem;
  border-left:4px solid var(--caramel);
  background:rgba(212,165,116,.16);
}

/* ---------- 页脚 ---------- */
.foot{
  position:relative;
  margin-top:2.4rem;
  padding:1.8rem clamp(1rem,3vw,2.4rem) 1.2rem;
  background:var(--paper-2);
  border-top:3px solid var(--ink);
}

.foot::before{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:0;
  height:6px;
  background:repeating-linear-gradient(90deg,var(--caramel) 0 22px,transparent 22px 44px);
}

.foot-head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:1rem 1.6rem;
  padding-bottom:1.2rem;
  border-bottom:1px dashed var(--line);
}

.foot-brand{margin:0;font-size:1.3rem;font-weight:700;letter-spacing:.12em}

.foot-sub{display:flex;flex:1 1 250px;gap:.5rem;max-width:420px}

.foot-input{
  flex:1;
  min-height:44px;
  padding:.4rem .7rem;
  font:inherit;
  font-size:1rem;
  color:var(--ink);
  background:rgba(255,255,255,.55);
  border:1px solid var(--ink);
}

.foot-btn{
  min-height:44px;
  padding:0 1.1rem;
  font:inherit;
  font-size:1rem;
  font-weight:600;
  color:var(--paper);
  background:var(--ink);
  border:1px solid var(--ink);
  cursor:pointer;
}

.foot-btn:hover{background:var(--caramel-d);border-color:var(--caramel-d)}

.foot-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1.4rem;
  padding-top:1.2rem;
}

.foot-nav dl{margin:0}

.foot-nav dt{margin-bottom:.4rem;font-size:1rem;font-weight:700;letter-spacing:.06em}

.foot-nav dd{margin:0 0 .15rem}

.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:1rem;
  color:var(--ink-2);
  text-decoration:none;
  border-bottom:1px solid transparent;
}

.foot-nav a:hover{color:var(--caramel-d);border-color:currentColor}

.foot-bar{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:1rem;
  margin-top:1.4rem;
  padding-top:.8rem;
  font-size:1rem;
  border-top:1px solid var(--line-2);
}

.foot-bar p{margin:0}
.foot-bar a{color:var(--ink-2)}

/* ---------- 滚动显现 ---------- */
html.js .content > article,
html.js .side,
html.js .foot-nav dl{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .6s ease,transform .6s ease;
}

html.js .content > article.in,
html.js .side.in,
html.js .foot-nav dl.in{opacity:1;transform:none}

/* ---------- 断点 ---------- */
@media (min-width:821px){
  main,
  .foot{margin-left:var(--railw)}

  .hero{
    grid-template-columns:1.02fr 1fr;
    gap:clamp(1.2rem,3vw,2.6rem);
    padding:1.4rem clamp(1rem,3vw,2.6rem) 2rem;
  }

  .hero-shot img,
  .hero-shot .ph{aspect-ratio:16 / 11}
}

@media (max-width:820px){
  .rail{
    right:0;
    bottom:auto;
    width:auto;
    height:var(--headh);
    flex-direction:row;
    align-items:center;
    gap:.4rem;
    padding:.35rem .6rem;
    border-right:0;
    border-bottom:1px solid var(--ink);
  }

  .rail-nav{display:none}

  .rail-brand{margin:0 auto;padding:.2rem .4rem;border:0}

  .rail-burger,
  .rail-find{width:auto;min-width:56px;height:44px;min-height:44px;flex-direction:row;gap:.35rem;font-size:1rem}

  main{padding-top:var(--headh)}

  .hero{padding-top:1rem}

  main [id]{scroll-margin-top:calc(var(--headh) + 1rem)}

  .foot-nav{grid-template-columns:1fr 1fr}
}

@media (min-width:981px){
  .wrap{
    grid-template-columns:230px minmax(0,1fr);
    gap:2.2rem;
    align-items:start;
  }

  .side{position:sticky;top:1.6rem}
  .side-list li{flex:1 1 100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js .content > article,
  html.js .side,
  html.js .foot-nav dl{opacity:1;transform:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}